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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fb495729274068dee3c2b42fba7ed1baf2378ae0ab425d89f3eea1a9ca21e1e' 
  AND token = 'BNV0ITN+QcwY0ISStEkeLsKashZVlE/zDZK5L86+y8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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