SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d13ecdce380268968d656957272627e85b16c443e59477a32e390415465bcf0' 
  AND token = 'abNngDp7nWupSZQsxB8fYIVV4XwrJWuhKgX9hI9/Xi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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