SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '668a2ab5ba35a19a7313cedc2559c27931037d71efcec665df6486c313945d2f' 
  AND token = 'f4f/4Ky6mstOBGUwC/Kx5uIYBxFuR7LLuZTk7q/fabU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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