SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80979e9a1de9032a8ca8d39866ed7adddd811bf8fbf41a42843291716e4f3552' 
  AND token = 'f+ptlnsgKm66KnTPj+GvdZUUrgrYo84KtMhM/Ye62Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}