Party Poker No-Limit Hold'em, $ BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FCP)

BB ($67.37)
UTG ($102.68)
MP ($45.85)
CO ($54.15)
Hero ($47.25)
SB ($67.90)

Preflop: Hero is Button with K , A . SB posts a blind of $0.25.
2 folds, CO raises to $2, Hero raises to $7, 2 folds, CO calls $5.

Flop: ($14.75) 4 , 3 , T (2 players)
CO checks, Hero bets $10

is this too aggressive against an unknown or is this pretty standard?

seems standard to me

If called, prepare to c/f river to anything less than a K or A.

without question

standard.