Hi sanjeev_abhish, not sure what month shall be your travel period.
AK 1254 from MAA to KUL arrives at 1455hrs (2:55pm).
Nonetheless, you could had done a fly thru, to know of a KUL-SIN connecting flight at that time,as there are two options for fly thru when making booking to SIN from MAA.-with connecting flight to SIN at either 1730hrs (AK715) or at 1900hrs(AK717)
You had done a fly thru booking if on your flight itinerary, you only have one confirmation code(also known as PNR-passenger name record), which is the 6(six) alpha numeric character found on top left hand corner of the printed itinerary.
With a fly thru, you need not go through Malaysian immigration,and your checked baggage is tagged to final destination(in this case to SIN-Singapore).
So once you deplane, proceed to transit hall,get boarding pass for KUL-SIN sector,and proceed to boarding gate.
You have sufficient time.
And one final thing, you do need visa,even though you are transiting in Malaysia, though you will know this information from AirAsia pop up window when making your booking.
Have a pleasant journey.