SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '220faba586f215eb966c7024e1912add204c8fce51bc78140f1976eab8a21afb' 
  AND token = 'HAAAnIsTxG6JsztZfmfY5hvM9gEwGD/g+3s+67OPndc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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