SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2f2ddfc22702bdf7af1db34535650a701b34d6159d966ff035ab60eb22df4b8' 
  AND token = 'fjF5+ogOhZ3oBKpfTu79/hwsUwKR1RG1O4ecXwBPwRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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