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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f676f0276e9a7ba7929624ffec9e2bb3494939fa3b792008e604991ebe975d2' 
  AND token = 'x8hPk/lQlZ0Zu5FRt20MqghdSREumIAIy3bNJ6YbuDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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