SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '148ba410a11ecd64b73c69474e7447796adf025f732a31f974aa9715b7970fb9' 
  AND token = '5v6LJn/l2JBb8IrlzgStroU9KZ6yIVWSZIgZELYu80c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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