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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c404c330adc89fa87dc0d78aec8181fed36fe314e3833886a2cb43fd80550f7' 
  AND token = '0iM80jfT8eMM6MImzhu+7DNbKAUI3ZWjv7IYR8C/vGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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