SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13f68e7c6410e2e2cf3645aa333e1581e24b79c41a04f5b7ae391167cc81c96d' 
  AND token = '0QGhG6NiyblTzJJBfCVPXm6VuVUNhc2UrUqywBng6ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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