SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e17ca12b35399bfe44d3f65431bfc5f469a86164ad35bf677d43b7a18fb9a8f0' 
  AND token = 'zyC3GXGDGQWJ7u4mvbr/whpBOoRNQdmgOwyK6MBiTt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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