SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87537763186ad99f942848fcfdd111f56e7adeb08673848ec2c98c569dcae3c2' 
  AND token = '07hVYS0P644BUAxt9taYK6DlaRCwWHmOzjl+YnNJ9ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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