Unimproved overs on low board

These situations still kick my [censored]. Only about 20 hands with villain, his AF is 1.5 and 30% VPIP. I'm totally lost, so comments/general tips much appreciated

PokerStars 0.50/1.00 Hold'em (6 handed) FTR converter on zerodivide.cx

Preflop: Hero is BB with K[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, MP calls, <font color="#666666">1 fold</font>, Button calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, MP calls, Button calls.

Flop: (6.50 SB) 4[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP raises</font>, Button calls, Hero calls.

Turn: (6.25 BB) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP bets</font>, Button calls, Hero calls.

River: (9.25 BB) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP bets</font>, Button folds, Hero folds.

Final Pot: 10.25 BB