"I saw the scoreboard, and I was nearing my 200 with five overs to go, so I decided to go for the kill.
"I reached 250 with just two overs to go, I told my partner, 'let me try if I can make 300', and I got 30 off the last over."
Maavi finished at 416-2 from 20 overs. Ahlawat's knock is believed to be a world record, bettering the 277 from 72 balls scored by Sri Lanka's Dhanuka Pathirana in a local match in Lancashire in 2007.
West Indian Chris Gayle holds the professional record having scored 175 in the IPL.
The son of a truck driver, Ahlawat's first stint at first-class level was a flop, as he made scores of one, four, duck, duck and duck for Delhi in three matches in October, 2015.
But the wicketkeeper-batsman believes he's ready for another opportunity and hopes his record score could lead to riches in next fortnight's Indian Premier League auction.
"Yes, I have put my name in IPL auction, but I am not sure if this knock will help make people notice me," he told ABP Live. "I am eager to prove my worth."