SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61203ae6f008f8ee6bc65be972604bb9d79459306e34dd2b19a318935a345d1a' 
  AND token = 'u0JSYP+Qzqg6yc4eaFIXkPu1kfIvy5gZx0bE6XV7wzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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