SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aadf4b98007f90cf90eb2c4ba7d238f4b28b6ba0bafff24864011cf5416c8c28' 
  AND token = 'JJhYK++VnfLUrLh5IfvlQxdAzgpiphuljx9vQVKgnzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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