Hyderabad, on the other hand, saw their eight-game unbeaten run come to an end as they dropped to the third in the table, having 16 points from 10 matches.
Hyderabad had a chance to take the lead early on when Edu Garcia's free-kick was deflected onto the crossbar by Prabhsukhan Gill after the ball was curled expertly over the wall.
Bartholomew Ogbeche was shown his fourth yellow card in the next minute, meaning he will miss the next match.
Hyderabad tried to up the ante but failed to muster any real opportunity in front of goal barring one where Kerala skipper Jessel Carneiro kept his side in the lead with a goalline clearance.