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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d48faff7af076e33ed39cfcc4b2e3ed22e40059ea2c6759b7bd8456c4775bce' 
  AND token = 'Xwv9Gry9lkWASXRZOI9rZ4gUGtLiaLJdxX8iM0Cm8kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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