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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04ad5ed17cdcab3d83fc81f381210370d406b904cd26af3eb801859206f1e971' 
  AND token = 'Wzk/qonD3eY1dH9qd7CnHR5YBFiMoSFrWiE+vt5GEZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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