Apple's 1-year limited warranty
Tied to the original purchase date — runs from when the first owner activated the device. Check at checkcoverage.apple.com.
AppleCare+
Transferable to a new owner. If the seller has it, get the proof of transfer.
Reseller warranty
At MacUAE every used Mac includes a 90-day parts & labour warranty serviced from our Dubai Media City office.
What to demand
A written warranty card with serial number, purchase date and contact phone.