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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb287545b481c914b48f1f12013d589b9a8a7139221af6ccef3caf62febab72b' 
  AND token = 'ffGiHaq97Ej/SzJ/z1F+WHw1LQedee5FzAMRCTyxYzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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