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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac15e4a25c8dc2fc02a8a76df2ad953bd6934455dad70ff68920283b9aea998a' 
  AND token = 'kHk5HDpSJbzeCv1cEHIf8tiLxBUIQonXdRWT7VjIpws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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