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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd15fe5d17a8e86a720b82e562eca446786eeff97f777acb36916c78f0f25b3b7' 
  AND token = 's0XNaj2lBwCLA2VyeUBktym3KczGmXs5z0OauDs7O5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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