SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '915d6613fa78f67f130ae18f8042dabd742c38db7275f2522f7a6a46a3efd876' 
  AND token = 'zNC7nohewZXAr9d/iAEATHZ0qmpWKgEZ3YFV+w9BGXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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