SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a5a63d2b24b0b82f09d0dc79e81ed73da7461646ce862287e0e99c989a947b6' 
  AND token = 'Z9GdpS7Vi/U9On5oqCvtK2BhpW8RKHjlDKEGjbmQAFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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