5NL: AK hits TP on river. river play?

PokerStars No-Limit Hold'em, $0.05 BB (9 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP3 ($10.65)
CO ($10.23)
Button ($5.55)
SB ($4.92)
Hero ($4.95)
UTG ($7.78)
UTG+1 ($4.91)
MP1 ($4.66)
MP2 ($4.04)

Preflop: Hero is BB with A, K.
1 fold, UTG+1 calls $0.05, 1 fold, MP2 calls $0.05, 1 fold, CO calls $0.05, Button calls $0.05, SB completes, Hero raises to $0.55, UTG+1 folds, MP2 folds, CO calls $0.50, Button folds, SB calls $0.50.

Flop: ($1.85) 5, 4, Q (3 players)
SB checks, Hero bets $1.35, CO calls $1.35, SB folds.

Turn: ($4.55) 7 (2 players)
Hero checks, CO checks.

River: ($4.55) K (2 players)
Hero ???

No read on villain. He snap-called the flop and snap-checked the turn, if that means anything.
Should I b/f, c/c, or c/f in this spot?

A read would be oso nice here, but I think I default to a b/f to get value from the queen hands you still beat.

He'll letcha know if he was slowplaying the flush or has the 2pr, but probably won't bet a queen anymore, so a c/c costs you the same as a b/f, but gets value from those hands you beat.