SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e2c23d88389173f75913cbe7e381a20637a3db968af394fe9d2cb2300d97754' 
  AND token = 'eBN02DWb4SZcMj1TAJsB/ovRZQ6UMcayWOrhOqGwBJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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