SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '252e2e1797ac967308009a8e85aaa605c6c3b53bc4fb45bd0bd1e1a041216845' 
  AND token = '5mT4okwJEO4BfcNfgLy1ORQeKKgejlLGHYzjOj5iCvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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