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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70cb7236809c7be4299c6c0e41c999c049a319b4f7e3856320cb316a28e03a96' 
  AND token = 'XRwA6ioSZjgONe9Za8r9BdjXwGRmqPkzrEwAedTL7tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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