SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82060ddbcb5d3b33d35795df1b8428f37a5978010be15f36c9bccae64dbc8c1f' 
  AND token = 'wvm1Gx5laaqjTMo5MXj7MfdwDy0YqBz/4LNf8lJZ2ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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