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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd484beb4499d400408c9d29df93b5909a14fe5f21855615eceb48f10a04a39d8' 
  AND token = 'gvM66nQohXQg/83UpT049IZhiKIwNdIjpFcadGTjVmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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