SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd817b3546c57a264284c8a49288f423771a93a9d4389ab1b8e030c319a74d7a' 
  AND token = '/39bE/+Rqta0FYBH+lgYqeeOIYVj7VAReC5Xwmj38fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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