SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a4c97454c6c08311d4b416a331ac4289dbbff5e20e04bbe173ca1ce8907063f' 
  AND token = 'siALvGfNhXxqBkPUAYICJuqkxZAdcTYb5FTKG6PsKTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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