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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67f03afbf59b6859f9f7eae0bb0366e47acdf3b07dece20437092585fc219fd0' 
  AND token = 'YaNMtjo5B0oiMB2xf9tG234SFOtqN6Aq9DuOqswiMEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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