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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '673983d97195b7f87e8ce726bd37f256dfec0d12a4c78acd7c6c9d83d3ed7cd9' 
  AND token = 'aC8XaB76zsm2fiw07vyWJ+To60CrvOCsDYQd7Fxe1ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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