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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df8a39a8848978d24a2097e265af14316a293c9dc879ebbbe68861b26a34aaed' 
  AND token = 'DlNOqy8fgtmm0KQYJSXVhIEqlTdrOyMaTNKV8p5MfVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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