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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '603a4b4a7976e77d5ec9546cf5df687d3d6009cbb6f21f877bc9d8219722bea3' 
  AND token = 'Cj++dmQ0tO7V0DmfrRMFsVl0u9N8Q1cNC0E78t8g5Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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