SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ce1572119d28d6f91bb209cb419a40137b0ad1bfac613a0f9d16cc759ea1045' 
  AND token = 'J9FECikJNvaLZzPClu+B+OgFuzCDCjQPeZK7bytY2lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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