well the thing is in order to renew any warranty including xbox (stated in the warranty terms)
you need to be in the general warranty period
since you are beyond that you will have to either pay for a repair and then renew the warranty then
(which would be 1 year plus whatever period you purchase)
best to call xbox support for pricing
thats the 1 year warranty not the extended 3 year warranty
- Extend your standard warranty by up to two years.
- To purchase the plan, your new product must still be under the standard warranty.
- Purchase the plan from the Xbox Online Service Center or at a Microsoft Store retail outlet.