SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d3241f8d94af3675903816a944ce8788f555ae43a96cb95037e412c0f23c165' 
  AND token = 'RzvPwn+1tfvUxzr9wvyf2mDkXJegS2Cm3tu+DUi1fGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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