NL25sh - AQo vs Limp Unknown

Hello
I have some question about my play.
What you think about calling on Flop?
Are we beat ?
Turn is easy call but the flop is little weird spot.
On the flop i dont see any draws and what is the value hand what opponent raises.
Only what i get vs this opponent was - preflop limp and not 100bb stack size.

Poker Stars, $0.10/$0.25 No Limit Hold'em Cash, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

UTG: $9.93 (39.7 bb)
MP: $20.65 (82.6 bb)
CO: $20.75 (83 bb)
BTN: $25.20 (100.8 bb)
SB: $14.25 (57 bb)
Hero (BB): $25 (100 bb)

Preflop: Hero is BB with A Q
2 folds, CO calls $0.25, 2 folds, Hero raises to $1.20, CO calls $0.95

Flop: ($2.50) A 8 3 (2 players)
Hero bets $1.40, CO raises to $4.25, Hero calls $2.85

Turn: ($11) 8 (2 players)
Hero checks, CO bets $15.30 and is all-in, Hero calls $15.30

River: ($41.60) 7 (2 players, 1 is all-in)