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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81e70c3750f0875b24f721eeb02c8c9eeb6d0a402d59c2b87e61dfe8c3d8b9d3' 
  AND token = 'AXSH3rbDWFRcVUi85a5mMnqGhrZ6aZj55j2zLe327Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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