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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '034054a2aea467a61c54238f674509d2cde828609d409ff9f2b032e6ec8b6e92' 
  AND token = 'CZRSxEoM4y04brtH50nPN2+Qu/jAI7tCw8pz6ABQkiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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