Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01c15e9abfe7d17f17090e50a39dd921d61cc056394da79b4fa7f2715afcbb02' 
  AND token = 'dc9a9jcpI6OB8p6CmiO3yXozxueLEdKHnWDIlGJmoAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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