Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a696c2aea2d6f870bd0f994e51c2ef477e2ccbbd46ef2128c4cf92067d4311c2' 
  AND token = '4L+QLIfYLiKeESNNUekCM9eJFr6cdttWbPz8R0Ef0EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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