SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff30a642dd8262a6ac742756d4120419fa3ffb083f4080764139b97a6e836d4e' 
  AND token = '/ZaDRuoLe+y81sBz/zZJkCPM5A4yFQHzpv831j1XJrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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