SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a53c8c2736c107f1ac4270a87a479a0cd2a03e424e8125396cea15c070b02d1' 
  AND token = 'GVsisJ2vKyK1qdzh+iA3jpy+XMhLm18CRDG9zqyymY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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