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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ac78ed4e220cf4afe79676909e105e00b89cef736ed8eb7094abb84f5db60a1' 
  AND token = '72V9REVj7yv08Gjg9bOuKti9FuvOxBrT6TJWwckQibU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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