PS 60$ - AK hits top pair vs unknown

[Luisgallo]

Villain is unknown, and I don't really like his flop check/call.
How is my line?


PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB (t5607)
UTG (t2010)
MP (t1865)
Hero (t1405)
Button (t1353)
SB (t1260)

Preflop: Hero is CO with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t265</font>, <font color="#666666">2 folds</font>, BB calls t165.

Flop: (t580) 5[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets t300</font>, BB calls t300.

Turn: (t1180) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets t840 (All-In)</font>, BB calls t840.

River: (t2860) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

Final Pot: t2860