Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfeddb9b7151fa6013ba4ffa9f2d4d09c999e4ccd89d108ea3521e698e153ce3' 
  AND token = '3zQLZ2TUrSCHVzabdZDeko790jUuQ06kfc1rofBUkUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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