SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f7235206b4328ea30ba9f6239427254ea46ac2aefdddc9f56c7ac145c29e858' 
  AND token = '2P3FysthqFTJ+/o3JwjniLoLIV2oDmoBKFgtl7Rnpbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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