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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef80555465435fc29f1fddc1577f590447c077329447fdc3fe73d425350366ca' 
  AND token = '4JK7TRjZ9BqXCRmM7akdn584laryzvUdhjzdflQsiT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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