SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b8b3bd006332b01e14112fc3851dd64a6698cb2fab0231a2dd7aa36940e22e5' 
  AND token = 'O7LV89noFf42Y/+y7MUvqHvfRKp8IYgTECsl/iNtfBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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