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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35c1b459c78db8d905122c822ba198442d7091fa9f5864e0a684897da80422d8' 
  AND token = 'Py30nvGMSEuy0efRHAwU9lxpSi5URG4G2XTYsPP7DUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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