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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '824e3267741d104dd3e89964cc7c980662ff48d6d24a3e0af0330b299cd7f828' 
  AND token = 'fm3rDWaO87att3W9Ja0Om773XaQC4TPWYP51XRkB7zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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