Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6df4666bac1e92ff23f6a9987e3dfcfd6de286b2d02dcf1faaa4717308c2862' 
  AND token = 'QiDj4kQE0q9BQTlLgfzb1rqAdzTbgCQQC8I0+9sDxqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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