SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '205d71bb5d0b2eed0ef9b65466df9c87976756297e63d044662c0e6834548005' 
  AND token = 'gPp4a0wuwv/Grqt/+CJD5DbYrWgC0q3BbaiCWBomE3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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