Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd515a13b4b74e6f8c86f13715eef8061e1427b590c64b263f78ed43efeb9156a' 
  AND token = 'YoUslfQmxiaV2t+jEdUOM0bYpMLO2TodHcDFRMT0ltw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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