SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2906a94d88d51463781a5f6a0a510a33d469cf7a8c681730e7647317551da52' 
  AND token = 'oGP+JbGrSCL7PJ8nLBAUKvzqt8Xz5+YMzhS6FeCTrac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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