SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1b58e3699af2dc078d3a05296992f4530951b9195f4bcdd94257d35fb147268' 
  AND token = 'Ic5w952NAunToGmVHknOTcG5K81DYgjCZaFkdvMFrU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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