SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83f1a06347ef3df57cc5a730287d3b61090a91919ebe56c90c7416d413f01492' 
  AND token = 'KBNjNBprRRzzMQAGJngtCjFuWaPXiQSPFRgoPfKtkzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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