Top pair and Top kicker flop all-in

Hi,

so I have here there that hard decision hand from 22$ bounty tournament. There is a raise and call and I decide to 3-bet with my AKs on SB, I do a bit bigger sizing because I will play OOP (would you do it even bigger?). Unfortunately got 2 calls. Dry A high flop with a backdoor flush. I feel like, great flop for me so I c-bet smaller and want some call from worse Aces and maybe something like 99-JJ. Instead of nice call, I get 3-bet all-in. So I have to call only 22bb to 82bb pot which seems like a too good price to me I also have a backdoor flush draw and He might be bluffing occasionally or trying to do that with AQ/AK. I feel like I have to call. What else would I call? Only sets? Looks too tight to me... Will he shav only sets? I am not sure. What do you think about that hand?

PokerStars - 200/400 Ante 40 NL - Holdem - 9 players
Hand converted by PokerTracker 4

BTN: 94.78 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 2)
Hero (SB): 37.13 BB
BB: 47.78 BB (VPIP: 100.00, PFR: 50.00, 3Bet Preflop: 0.00, Hands: 2)
UTG: 35.2 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 2)
UTG+1: 109.27 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 1)
MP: 28.1 BB (VPIP: 50.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 2)
MP+1: 11.07 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 2)
MP+2: 112.89 BB (VPIP: 23.08, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 13)
CO: 70.39 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 2)

9 players post ante of 0.1 BB, Hero posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 2.4 BB) Hero has K♠ A♠

fold, UTG+1 raises to 2 BB, fold, fold, fold, fold, BTN calls 2 BB, Hero raises to 7 BB, fold, UTG+1 calls 5 BB, BTN calls 5 BB

Flop: (22.9 BB, 3 players) 4♠ A♣ 8♥
Hero bets 8 BB, fold, BTN raises to 28 BB, Hero raises to 30.03 BB and is all-in, BTN calls 2.03 BB

Turn: (82.96 BB, 2 players) 7♠

River: (82.96 BB, 2 players) 2♣