SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06119ba27457d04ba1d0a880000fc948bc7e595fec63e9371c516e6c77252863' 
  AND token = 'd/PM4+P1BflHKaxnMqqNgJjV1JnjwRB60s9tocl4vBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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