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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6511c247fd8689475729c10102f7c6a1a645dcf8296fc24cc29821ef19f909b7' 
  AND token = 'XtpLWf0yHImgxXkgZ6Udn708JUXO+WyCb5dQzTbAjv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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