Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '838e516e1a0a701a3546e6645dffe954f4183f5ad3e66d96494799b15f951432' 
  AND token = 'UdUd7BqM+9jME14tSVlFO3CFSTMefm3B5AtMCWeyRD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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