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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37a18040e6fbef1b8f271c421e186b36016e67ca6c0019e579d9a4a6af649705' 
  AND token = '9A5jNijhcyn7ZCvhH7h06BZ8Q8yg0SbmS3JmppExStU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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