SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ff6bd6ffc9d5ba22f41de2c712b18f58599e68bd79fdae8b10746fb53c698aa' 
  AND token = 'WDPenhDzCYsy4p+vqG00/klFgQyc7ycHwfphT43P9hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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