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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9455cae5ae570749ac75b27a388b9ad540edf37ce28d84abefa8d40862f029f5' 
  AND token = '/SFy5jo+d7amfnOGwa8xgjANC5pwCSb7Z5J+w8pQuR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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