SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd12c4dbbd28d8d45597095d2ced53a0fe632a582bb076fbbc5f113f7d750677' 
  AND token = 'tui9hyzXb4qtrQqEnOgCM2ddKgSJqiE/vjVU1pFDW4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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